278845859880 has 640 divisors, whose sum is σ = 1142624102400. Its totient is φ = 59537866752.

The previous prime is 278845859869. The next prime is 278845859899. The reversal of 278845859880 is 88958548872.

278845859880 is a `hidden beast` number, since 2 + 7 + 8 + 8 + 458 + 5 + 98 + 80 = 666.

It is a super-2 number, since 2×278845859880² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (72) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 278845859799 and 278845859808.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 52819081 + ... + 52824359.

It is an arithmetic number, because the mean of its divisors is an integer number (1785350160).

Almost surely, 2^278845859880 is an apocalyptic number.

278845859880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 278845859880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (571312051200).

278845859880 is an abundant number, since it is smaller than the sum of its proper divisors (863778242520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

278845859880 is a wasteful number, since it uses less digits than its factorization.

278845859880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5463 (or 5450 counting only the distinct ones).

The product of its (nonzero) digits is 412876800, while the sum is 72.

The spelling of 278845859880 in words is "two hundred seventy-eight billion, eight hundred forty-five million, eight hundred fifty-nine thousand, eight hundred eighty".